Vaporizer for anesthetic

ABSTRACT

Narcosis apparatus comprising a vaporizer equipped with a filler assembly consisting essentially of a horizontal member and a member rotatable thereon to a filling position and is provided with bore holes that align themselves only when in filling position, the exterior opening of the bore holes when aligned being at the same level as the preselected maximum liquid level within the vaporizer so that the latter will automatically be prevented from overfilling.

United States Patent [72] inventor l-lans Georg Breiling [56] ReferencesCited Gummy UNITED STATES PATENTS [211 PP 987 51s 3/1911 Wendling141/301x Dec. 24, 2 9 8 h U Patented y 11,1971 3 Bos etal. 141/301X [73]Assignee Dragerwerke, Heinr. 8L Bernh. Drager nmary Examiner-Robert M.Walker Lubeck, Germany Attorney-Curtis, Moms and Safford [32] PriorityJan. 2, 1968 [33] Germany [31] P 16 16 191.4

ABSTRACT: Narcosis apparatus comprising a vaporizer equipped with afiller assembly consisting essentially of a 5 Q AIYESTHE'HC horizontalmember and a member rotatable thereon to a filling bums 3 Drawmgposition and is provided with bore holes that align themselves [52] Us.(I 141/301 only when in filling position, the exterior opening of thebore [51] Int. Cl B65b l/04 holes when aligned being at the same levelas the preselected [50] Field of Search 141/311, maximum liquid levelthe vaporizer so that the latter 285 301 will automatically be preventedfrom overfilling.

4 c l l /6 6 /5 /4 7 3;; 6 I Mn 3 7a 72 g 7/ f 73 1 VAPORIZER FORANES'IIIET-IC This invention relates to an improved overflowconstruction in vaporizers for anesthetics such as that described incopend ing application Ser. No. 761 ,089 filed Sept. 20, I968.-

The improvement of this invention is applicable particularly toVaporizers equipped with a filler assembly communicating with theinterior ofthe vaporizer at a-level below the preselected maximum liquidlevel and preferably at the low point in the vaporizer so that thefiller assembly can also be utilized to drain the vaporizer, theassembly consisting essentially of a substantially horizontal memberhaving a longitudinal conduit communicating with a transverse. conduitin a rotatably member adapted to be connected to a source of anestheticfor filling the vaporizer.

Generally, the vaporizer to which the improved overflow construction ofthis invention is most readily adaptable is one provided with a fillerassembly comprising a substantially horizontal filler connection havinga longitudinal conduit'and an intersecting transverse conduit near theouter end, and a second filler connection mounted for rotation on theouter end of the horizontal filler connection, the rotatable connectionhaving a second transverse conduit communicating with the intersectingtransverse conduit to provide uninterrupted communication from a sourceof anesthetic, through the mouth and length of the conduits in therotatable and horizontal connections, and into the vaporizer. In apreferred embodiment of the vaporizer to which the overflow constructionis most advantageously applied, the horizontal filler connection leadsdirectly to the low point in the vaporizer so that thefiller assemblycan also be used to drain the vaporizer.

The overflow construction of this invention has the advantage ofautomatically being open only when the filler assembly is in fillingposition. The construction is such that the mouth of the overflow is atthe same elevation as the preselected maximum liquid level within thevaporizer when I when the preselected maximum liquid level is exceeded,thus making impossible 'an inadvertent or careless filling of thevaporizer to above the desired maximum liquid level. Another feature ofthe present invention is the provision of conical mating bearingsurfaces for sealing the juncture between the horizontal and rotatablefiller connections against leakage of fluid.

These and other features, details of construction and advantages willbecome apparent from the following description and the accompanyingdrawing in which:

FIG. 1 is a sideview of a vaporizer provided with a filler assemblyshown in section; FIG. 2 is a side view in cross section taken alongsection'line A-B of FIG. I; and I FIG. 3 is a side view in cross sectiontaken along section line The transverse conduit 4, as shown, terminatesin an annular groove 5 in the horizontal filler connection 2. Thehorizontal filler connection 2 is further provided with an annularrecess 6 to accommodate, for pivotal rotation about the longitudinalaxis of connection 2, a rotatable filler connection 7 having a matingbore 8 and retained on the outer end of filler connection 2 by means ofa screw cap 9.

The rotatable filler connection 7 is further provided with a sealingring 11 to avoid leakage between members 2 and 7, and a secondtransverse conduit or bore 12 terminating in a spring-loaded valveassembly including a valve seat 13, washer 14,.plug 1s, sprin I6 andscrew cap l7-formin a s ace 18 communicating W a filler conduit 20 and t'rea s 21 for receiving a cylinder shown in phantom at 40 in FIG. 2 anddescribed more fully in copending application Ser. No. 761,089. Thefilling positions of rotatable filler-connection 7 and conduit 12 areshown in phantom at 7b and 12a, respectively, and their drainagepositions are shown in phantom at 7c and 12c, respectively.

Referring now to FIG. I and to FIG. v3, the latter showing the rotatablefiller connection 7 in filling position 712, the outer end of thehorizontal filler connection 2 has a shoulder 70 carrying a ring 71having a conical profile and bearing surface 72 keyed or otherwiseaffixed to the connection'2 to avoid rotation. There is a radial bore 73from conduit 3 through ring 71 to the effective upper surface of member7 said bore 73 communicating with bore 74 in filler connection 7 onlywhen the latter is in filling position 7b, as shown in FIG. 3. The bore74 terminates'in a mouth 75 which is'open to the exterior at a levelsubstantially the same as the preselected maximum liquid level shown at42 in the gauge or inspection window 41.

In operation, the vaporizer is filled by screwing a flask or othercontainer 40 of liquid anesthetic into the threaded portion 21, rotatingthe flask and rotatable connection 7 as a unit to the filling positionshown in FIG. 3 and with phantom lines in FIG. 2. When sufficient liquidhas passed through conduit 12, annular groove 5 and conduits 4 and 3 tofill the vaporizer to the preselected maximum level 42, liquid willoverflow through bores 73, 74 if the filling is not halted, thusautomatically preventing overfilling. As soon as the rotatableconnection 7 is rotated to another position, such as that shown in FIGS.1 and 2, the bore 73 is sealed because of nonalignment thereofwithbore'74.

When the vaporizer l is drained, e.g., by rotating the rotatableconnection to the position 70 shown in FIG. 2, the bore 73 remainssealed, thus avoiding spillage of anesthetic.

, Iclaim:

I. In a vaporizer for ananesthetic comprising a vessel having avaporizing chamber having a low point for containing and vaporizing aliquid anesthetic and an assembly of filler connections for filling saidchamber with said liquid anesthetic to a preselected maximum level, saidassembly comprising (A) a substantially horizontal filler connectionhaving inner and outer ends, a first, longitudinal conduit closed at theouter end and communicating at the inner endwith the interior of thechamber at a point below said preselected maximum level, anda'transverse conduit intersecting the longitudinal conduit inwardly ofthe outer end; and (B) a second filler connection mounted for rotationon the outer end of the horizontal filler connection to a fillingposition, said second connection having a second conduit communicatingat one end, when it is in filling position, with the transverse conduitandat the other end with means for receiving liquid anesthetic from acontainer therefor, the improvement which comprises a radial bore fromthe longitudinal conduit to the upper surface of the horizontal fillerconnection and a second bore in the rotatable connection adapted tocommunicate at one end with the upper end of the first bore only whenthe second filler connection is in filling position.

2. A vaporizer as defined in claim 1 wherein a conical bearing surfaceis provided at the outer end of the horizontal filler connection and therotatable filler connection has a mating bearing surface for sealing theoffiller connections against leakage.

3. A vaporizer as defined in claim 2 wherein at least one of saidbearing surfaces is a ringmember having a conical profile.

4. A vaporizer as defined in claim 1 wherein-the horizontal fillerconnection is directly in line with the low point of the vaporizingchamber.

5. A vaporizer as defined in claim 1 wherein an annular groove isprovided in the horizontal filler connection for communication betweenthe second and transverse conduits in all positions of the rotatablefiller connection.

1. In a vaporizer for an anesthetic comprising a vessel having avaporizing chamber having a low point for containing and vaporizing aliquid anesthetic and an assembly of filler connections for filling saidchamber with said liquid anesthetic to a preselected maximum level, saidassembly comprising (A) a substantially horizontal filler connectionhaving inner and outer ends, a first, longitudinal conduit closed at theouter end and communicating at the inner end with the interior of thechamber at a point below said preselected maximum level, and atransverse conduit intersecting the longitudinal conduit inwardly of theouter end; and (B) a second filler connection mounted for rotation onthe outer end of the horizontal filler connection to a filling position,said second connection having a second conduit communicating at one enD,when it is in filling position, with the transverse conduit and at theother end with means for receiving liquid anesthetic from a containertherefor, the improvement which comprises a radial bore from thelongitudinal conduit to the upper surface of the horizontal fillerconnection and a second bore in the rotatable connection adapted tocommunicate at one end with the upper end of the first bore only whenthe second filler connection is in filling position.
 2. A vaporizer asdefined in claim 1 wherein a conical bearing surface is provided at theouter end of the horizontal filler connection and the rotatable fillerconnection has a mating bearing surface for sealing the assembly offiller connections against leakage.
 3. A vaporizer as defined in claim 2wherein at least one of said bearing surfaces is a ring member having aconical profile.
 4. A vaporizer as defined in claim 1 wherein thehorizontal filler connection is directly in line with the low point ofthe vaporizing chamber.
 5. A vaporizer as defined in claim 1 wherein anannular groove is provided in the horizontal filler connection forcommunication between the second and transverse conduits in allpositions of the rotatable filler connection.